关键词: 磺化反应, 三氧化硫, 卤代萘

Abstract: The sulfonation of the six halonaphthalenes with SO₃ in dichloromethane as the solvent was studied by using ¹H NMRas method of analysis of the resulting mixure of sulfo derivatives. Monosulfonation of 1-fluoronaphthalene yields only the 4-S, where the other three 1-halonaphthalenes yielded in addition to some 5-S. Further sulfonation of any of the four 1-halonaphthalenes-4-S's yields a mixtures of the 2, 4-S₂, and 4, 7-S₂, and eventually also some 2, 4, 7-S₃. Sulfonation of 2-chloro-and 2-bromonaphthalenes with 1. 0 mole of SO₃ yields a mixture containing predominantly 8-S(～85%) with small amount of 4-S(～15%).The eventual products on using>4. 0 mole of SO₃ are 4, 7-S₂, and 6, 8-S₂.

Key words: Sulfonation, Sulfur trioxide, Halonaphthalenes